Measurement of dust conversion factor for the JET carbon divertor phases

J. Likonen (Corresponding Author), J.P. Coad, A. Hakola, J. Karhunen, S. Koivuranta, R. Pitts, A.M. Widdowson, JET contributors

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.
Original languageEnglish
Pages (from-to)842-846
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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tiles
Dust
Tile
Carbon
dust
carbon
flakes
Film growth
markers
Particles (particulate matter)
Plasmas

Cite this

Likonen, J. ; Coad, J.P. ; Hakola, A. ; Karhunen, J. ; Koivuranta, S. ; Pitts, R. ; Widdowson, A.M. ; contributors, JET. / Measurement of dust conversion factor for the JET carbon divertor phases. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 842-846.
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abstract = "We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10{\%}. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.",
author = "J. Likonen and J.P. Coad and A. Hakola and J. Karhunen and S. Koivuranta and R. Pitts and A.M. Widdowson and JET contributors",
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Measurement of dust conversion factor for the JET carbon divertor phases. / Likonen, J. (Corresponding Author); Coad, J.P.; Hakola, A.; Karhunen, J.; Koivuranta, S.; Pitts, R.; Widdowson, A.M.; contributors, JET.

In: Journal of Nuclear Materials, Vol. 463, 2015, p. 842-846.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Measurement of dust conversion factor for the JET carbon divertor phases

AU - Likonen, J.

AU - Coad, J.P.

AU - Hakola, A.

AU - Karhunen, J.

AU - Koivuranta, S.

AU - Pitts, R.

AU - Widdowson, A.M.

AU - contributors, JET

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PY - 2015

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AB - We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

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DO - 10.1016/j.jnucmat.2014.10.066

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EP - 846

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